Evaporator.



PATENTED SEPT. 8, 1908.

E. VON SEEMEN.

EVAPORATOR.

APPLICATION FILED AUG. 21, 1906.

Firs.

UNITED STATES PATENT OFFICE.

ERIGH VON SEEMEN, OF RHEINFELDEN, SWITZERLAND.

nvnrona'ron.

Specification of Letters Patent.

Patented Sept. 8, 1908,

Application filed August 21, 1906. Serial No. 331,443.

My invention relates to improvements in evaporators of the class which may be used for the condensation of fluid substances or for crystallization, and its objects are, first,

to provide in an evaporator of the kind re' ferred to -a central chamber which is not in close contact with the heater drum, receives the boiling fluid ascending in the tubes of the latter and permits a settling of the inspissated fluid or crystals in the bottom compartment; second, to provide an intermediate compartment between. the said central chamber and heater drum, and, third, to provide for the controllable supplial of the said intermediate compartment with fresh fluid to regulate the temperature therein.

I attain my objects by the construction illustrated on the drawing herewith in which Figure 1 is a vertical section through an evaporator as herein described and Fig. 2 a horizontal transverse section divided into two halves, one half being on the line CD of Fig. 1 and the other on the line EF of the same figure, the section shown in Fig. 1'

being on the line AB of Fig. 2.

My drawing shows a. cylindric apparatus comprising: central chamber R formed by a hollow cy der a headed by a conical enlargement resembling a funnel, the upper rim of which is secured'all around in the'shell of the apparatus. Concentric but not close to the said cylinder 11 there is provided the heater drum H comprising an inner circular wall 0 and extending to the shell of the apparatus which forms its circumference. In the said heater drum there are contained vertical pi es 0 set in the bottom and top plates w 'ch are perforated for the purpose. perforated top-plate? extends from the shell of the ap aratu's'direct to the circumference of the cy der a, thus covering not only the heater drum, but also the space between the sa1 d drum and the central cylinder and by this way forming an annular intermediate compartment T which is closed on top and open at the bottom. Beneath the said cylnder a, compartment T and heater drum H is the bottom compartment S adaptedfor the collection therein of the inspissated fluid and for the settlement of the crystals.

The

Into the compartment T are conducted pipes f adapted to convey a controllable supply of fresh fluid into the same while another series of supply 1pipes '1', ends in the rim of the aforesaid funne and is likewise adapted to sup ly fresh fluid. In the upper portion of the unnel are further provided slots h for the passage of the vapors and in the central cylinder, just above the upper plate e of-the heater drum, is another series of slots 9 adapted for the passage of fluid. coming from the'pipes c in t e heater drum. The com partment T being as described closed on top and 0 en at. the bottom is not in the way of the clrculation going on in the evaporator and extending from the heater pipes 0 into the central compartment R, gomg down within the same and upwards a ain into the said heater pi es 0, but forms a d of insulating space etween the said central compartment and heater drum, the temperature within the compartment T being regulated by opening the conduits f to admit so much fresh fluid as may be required toreduce the temperatureand, conse uently, at the same time the evaporation in t e central chamber, and by closing the conduits again when the process in the central chamber ecomes hable to be im aired by too much coohng. The fresh flui received through the pipesgraduall removes any of the old fluid WhlCh may still be present within the com artment, such fluid on being removed and a 'ter leaving the compartment joining-slowly in the. circulation above referredto and also prevents the crustation of matter on the com aratively cool cylinder. The heat radiate from the heater-drum H'wh1ch would act upon the central chamber'R is by the regulation of the temperature within the com artment T to a certain extent also regulate and is reduced so much that the evaporation goes on.

diately above the heater drum the process is rather turbulent. The boiling fluid passed through the pipes 0 goes over into the central compartment R by assing the aforesaid slots in the central c amber except that any foam bubbles and boiling waves remain behind. The regulated temperature in the compartment T causes a division of the fluid in the central chamber, those parts which are sufliciently. inspissated and, are therefore heavier going down and collecting in the bottom compartment S, while those parts which are not sufliciently condensed and are therepatented showing features which might be confounded with features in my own device. In this respect I refer to certain slots contained in an eva orator described in United States Patent 0. 762,915, dated June 22, 1904twhich slots are, however, rovided beneath the fluid-level which wou d not do in my construction in which the traveling speed in the central compartment R would become too rapid and liable to entirely defeat the advantages of my invention.

VVhatI claim is:

In an evaporator for the condensation of fluid substance and crystallization comprising the combination with an eva orator-shell of a cylinder forming acentral c amber ending on top in a funnel provided with slots in its upper portion, a heater-drum containing vertical pipes and surrounding concentrically the said cylinder, an annular s ace being left intermediate compartment closed on top and open at the bottom, feed pipes conducted into the said intermediate compartment and ada ted to supply it with fresh fluid, and siml ar pipes opening into the rim of the funnel, also adapted to admit fresh fluid, the aforesaid cylinder 0 having slots close above the top-end of the heater,all substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

ERICH VON SEEMEN.

Witnesses:

" GEO. GIFFonD, 4 ANDREW HEER. 

